Rev2 and TC electronic m-one xl vs Lexicon mpx 550?
I don't have the above FX processors, but I am having very good results combining the Rev2 with the Lexicon MX400. The MX400 can process two stereo inputs simultaneously, allowing me to put additional processing on both Rev2 channels. At the moment I am simulating a kind of shimmer effect, with both MX400 channels in a feedback loop using my mixers aux feeds. This can sound very good on some of my Rev2 patches.
I also use a Lexicon MPX500, but it currently is dedicated to my Nord Rack 2.